1、修改主机名 （永久性 无需重启）
[root@linux-node2 ~]# hostnamectl set-hostname gitlab.example.com
[root@gitlab ~]#
#使用这种方式修改，可以永久性的修改主机名称！
2、桌面系统
[CentOS6] GNOME 2.x
[CentOS7] GNOME 3.x（GNOME Shell）3、文件系统
[CentOS6] ext4
[CentOS7] xfs4、内核版本
[CentOS6] 2.6.x-x
[CentOS7] 3.10.x-x
五、启动加载器
[CentOS6] GRUB Legacy (+efibootmgr)
[CentOS7] GRUB2六、防火墙
[CentOS6] iptables
[CentOS7] firewalld #已可以通过yum install iptables 去安装七、默认数据库
[CentOS6] MySQL
[CentOS7] MariaDB #默认root是有密码的，去日志中查看，修改密码的表也变了八、文件结构
[CentOS6] /bin, /sbin, /lib, and /lib64 在/下
[CentOS7] /bin, /sbin, /lib, and /lib64 移到/usr下九、主机名
[CentOS6] /etc/sysconfig/network
[CentOS7] /etc/hostname十、时间同步
[CentOS6]
$ ntp
$ ntpq -p
[CentOS7]
$ chrony
$ chronyc sources十一、修改时间
[CentOS6]
$ vim /etc/sysconfig/clock
ZONE="Asia/Tokyo"
UTC=fales
$ sudo ln -s /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
[CentOS7]
$ timedatectl set-timezone Asia/Tokyo
$ timedatectl status十二、修改地区
[CentOS6]
$ vim /etc/sysconfig/i18n
LANG="ja_JP.utf8"
$ /etc/sysconfig/i18n
$ locale
[CentOS7]
$ localectl set-locale LANG=ja_JP.utf8
$ localectl status十三、服务相关
1）启动停止
[CentOS6]
$ service service_name start
$ service service_name stop
$ service sshd restart/status/reload
[CentOS7]
$ systemctl start service_name
$ systemctl stop service_name
$ systemctl restart/status/reload sshd自启动
[CentOS6]
$ chkconfig service_name on/off
[CentOS7]
$ systemctl enable service_name
$ systemctl disable service_name服务一览
[CentOS6]
$ chkconfig --list
[CentOS7]
$ systemctl list-unit-files
$ systemctl --type service强制停止
[CentOS6]
$ kill -9
[CentOS7]
$ systemctl kill --signal=9 sshd (13)网络
1）网络信息
[CentOS6]
$ netstat
$ netstat -I
$ netstat -n
[CentOS7]
$ ip n
$ ip -s l
$ ss2）IP地址MAC地址
[CentOS6]
$ ifconfig -a
[CentOS7]
$ ip address show3）路由
[CentOS6]
$ route -n
$ route -A inet6 -n
[CentOS7]
$ ip route show
$ ip -6 route show(14)重启关闭
1）关闭
[CentOS6]
$ shutdown -h now
[CentOS7]
$ poweroff
$ systemctl poweroff2）重启
[CentOS6]
$ reboot
$ shutdown -r now
[CentOS7]
$ reboot
$ systemctl reboot3）单用户模式
[CentOS6]
$ init S
[CentOS7]
$ systemctl rescue4）启动模式
[CentOS6]
[GUICUI]
$ vim /etc/inittab
id:3:initdefault:
[CUIGUI]
$ startx
[CentOS7]
[GUICUI]
$ systemctl isolate multi-user.target
[CUIGUI]
$systemctl isolate graphical.target
默认
$ systemctl set-default graphical.target
$ systemctl set-default multi-user.target
当前
$ systemctl get-default十六、nmtui 替换了 setup 功能
Centos6
[root@files ~]# setup ##centos6
Centos 7
[root@node02 ~]# nmtui ##centos7